JP6920536B2 - Radios and radio communication systems - Google Patents

Description

The present invention relates to a wireless communication system, and is particularly applicable to a wireless device and a wireless communication system using a short wave band.

A wireless communication system that uses the short wave band (HF band) generally communicates using ionospheric propagation. By using this ionospheric propagation, long-distance communication outside the line of sight is possible. However, the ionosphere is affected by seasons, time zones, solar activity, and so on. Therefore, the frequency that can cover the target communication area changes depending on the season and time zone. Because of this feature, a wireless communication system that uses the HF band is generally a system that has a plurality of available frequencies and can maintain communication 24 hours a day, 365 days a year.

On the other hand, a general ad hoc routing protocol is a protocol that presupposes IP routing at a single frequency.

Japanese Unexamined Patent Publication No. 2004-274723 Japanese Unexamined Patent Publication No. 2007-311909 Japanese Unexamined Patent Publication No. 2010-034974

A general ad hoc routing protocol is a protocol that presupposes IP routing at a single frequency, and is suitable for a wireless communication system that uses the short wave band (HF band) to communicate by using multiple available frequencies properly. There is a problem that it is not.

An object of the present disclosure is to provide a radio capable of ad hoc communication in consideration of frequency.

Other challenges and novel features will become apparent from the description and accompanying drawings herein.

The following is a brief overview of the representative ones of the present disclosure.

That is, a radio that switches and communicates with a plurality of frequencies in the short wave band includes an ad hoc routing protocol, a routing table, and a frequency table. The frequency table includes a destination IP address and frequency information. When transmitting an IP packet to the destination IP address, the frequency used by the radio is set based on the frequency information.

According to the above radio, ad hoc communication in consideration of frequency is possible.

It is a figure which shows the configuration example of the wireless communication system which concerns on Example 1. FIG. It is a figure which shows the structure of the frequency table FTBL which concerns on Example 1. FIG. It is a flow chart which shows the transmission flow of the IP packet which concerns on Example 1. FIG. It is a figure which shows the configuration example of the wireless communication system which concerns on Example 2. FIG. It is a figure explaining the update of the routing table RTBL which concerns on Example 2. FIG. It is a figure explaining the transmission of the IP packet which concerns on Example 2. FIG.

Hereinafter, embodiments and examples will be described with reference to the drawings. However, in the following description, the same components may be designated by the same reference numerals and repeated description may be omitted. The drawings may be represented schematically as compared with actual embodiments in order to clarify the description, but they are merely examples and do not limit the interpretation of the present invention.

(Embodiment)
Existing ad hoc routing protocols, such as OLSR (Optimized Link State Routing Protocol), are specified in RFC3626. The existing ad hoc routing protocol updates the routing table based on the link information between the nodes (information that bidirectional communication has been confirmed). Since it only updates the routing table, it is originally a routing protocol that is premised on communication at a single frequency.

In the embodiment of the present invention, the existing ad hoc routing method is extended and the link frequency information is also added and managed. The link frequency information can be managed as a frequency table (FTBL) or as a gateway in the routing table. As a result, in particular, in a wireless communication system in which a short wave band (HF band) is used as a frequency band and communication is performed between radio stations using a plurality of available frequencies, the optimum frequency between radio stations (radio stations) can be set. Use to enable ad hoc IP communication.

Hereinafter, the first embodiment will be described with reference to the drawings.

FIG. 1 is a diagram showing a configuration example of a wireless communication system according to the first embodiment.

The wireless communication system 1 is a wireless communication system that uses a short wave band (hereinafter, also referred to as an HF band) as a frequency band and communicates between radios (radio stations) using a plurality of available frequencies. The wireless communication system 1 includes a radio (first radio) 10 and a radio (second radio) 20. The radio 20 is a radio that can use frequencies in the HF band.

The radio 10 is configured to be able to switch between a plurality of available frequencies in the HF band. The plurality of frequencies include, for example, a plurality of frequencies (first frequency f1, second frequency f2, third frequency f3, fourth frequency f4, etc.), each of which is a different frequency.

The radio 10 includes an ad hoc routing protocol ADRP, a routing table RTBL, and a newly provided frequency table FTBL. The routing table RTBL and the newly provided frequency table FTBL are tables referred to by the ad hoc routing protocol ADRP at the time of routing.

The radio 10 switches the available frequencies at regular time intervals (f1-> f2-> f3->, f4), and at each frequency (f1, f2, f3, f4), the Hello message (first). Message) HMG1 is transmitted from the antenna 11 and waits for a Hello message from another node (for example, radio 20). Hello message (second message) HMG2 from another node (radio 20) that includes information about its own node (IP address of radio 20) within a certain period of time (within a predetermined time) from the transmission of Hello message HMG1. Is received, the routing table RTBL is updated (12) based on this link information. At this time, the frequency table FTBL is also updated (13).

FIG. 2 is a diagram showing a configuration of a frequency table FTBL according to the first embodiment. The frequency table FTBL is composed of a destination IP address and a linked frequency (frequency information). The linked frequency (frequency information) indicates the frequency used when communicating with the radio 20 assigned to the destination IP address.

FIG. 2 illustrates, for example, link information when a Hello message HMG2 is received from a radio having a destination IP address of 192.168.1.1 at a frequency f1 (for example, 4 MHz), and a destination IP address of 192. The link information when the Hello message HMG2 is received at the frequency f2 (for example, 6 MHz) from the radio of 168.1.2 is described.

The radio 10 repeatedly updates the routing table RTBL and the frequency table FTBL for the number of available frequencies. For example, when there are four available frequencies (f1, f2, f3, f4), the routing table RTBL and the frequency table FTBL are updated by repeating four times.

When the maintenance time of a certain route elapses for a predetermined time, the route is deleted from the routing table RTBL. At this time, the information of the destination IP address and frequency of the route registered in the frequency table FTBL is also deleted.

FIG. 3 is a flow chart showing a transmission flow of the IP packet according to the first embodiment.

When transmitting an IP packet, first, it is confirmed whether the destination IP address of the IP packet exists in the routing table RTBL (step S1). When the destination IP address of the IP packet exists in the routing table RTBL (Y), the frequency table FTBL is referred to, and the frequency used by the radio 10 is based on the frequency recorded in the frequency table FTBL (for example, f1). Change or set (step S2), and transmit the IP packet. Further, in step S1, when the destination IP address of the IP packet does not exist in the routing table RTBL (N), the process ends without transmitting the IP packet.

According to Example 1, the following one or more effects can be obtained.

1) In a wireless communication system that communicates by using a plurality of available frequencies properly, it is possible to provide ad hoc communication including frequencies.

2) A frequency table FTBL is newly provided in the radio 10 configured to be able to switch between a plurality of available frequencies in the HF band. The frequency table FTBL is composed of an IP address (destination IP address) of a communicable radio 2 and a frequency that can be linked. This enables ad hoc IP communication using the optimum frequency between radio stations (radio devices).

3) The frequency table FTBL is updated at regular intervals. A wireless communication system that uses the shortwave band (HF band) communicates using ionospheric propagation, but the ionosphere is affected by the season, time zone, solar activity, etc., and the purpose depends on the season and time zone. The frequency that can cover the communication area changes. By updating the frequency table FTBL at regular time intervals, it is possible to perform wireless communication using an appropriate frequency according to the season and time zone.

Next, the second embodiment will be described with reference to the drawings.

The radio 10 of the first embodiment has shown an example in which a plurality of available frequencies in the HF band can be switched. In the second embodiment, a configuration example of a radio device in which available frequencies in the HF band are assigned to a plurality of radio units is shown.

FIG. 4 is a diagram showing a configuration example of the wireless communication system according to the second embodiment. FIG. 5 is a diagram illustrating the update of the routing table RTBL according to the second embodiment. FIG. 6 is a diagram illustrating transmission of an IP packet according to the second embodiment.

The wireless communication system 1a includes a wireless device 10a and a wireless device 20.

The radio 10a includes a communication control unit 14, a plurality of radio units 15-18, and an IP network IPNW that connects the communication control unit 14 and the plurality of radio units 15-18. The IP network IPNW connects the communication control unit 14 and the plurality of wireless units 15-18 with the same sub-network.

Note that, in FIG. 4, four radio units 15-18 are illustrated by way of example, but the present invention is not limited to this. The number of radio units may be two, three, or more than four.

The communication control unit 14 includes a routing table RTBL and an ad hoc routing protocol ADRP, and 192.168.1.5 is assigned to the IP address of the communication control unit 14, for example.

The radio unit 15 has an antenna AN15, and the radio unit 15 is assigned a first frequency f1 as a usable frequency in the HF band. For example, 192.168.1.1 is assigned to the IP address of the wireless unit 15. The radio unit 16 has an antenna AN16, and the radio unit 16 is assigned a second frequency f2 as a usable frequency in the HF band. For example, 192.168.1.2 is assigned to the IP address of the radio unit 16. The radio unit 17 has an antenna AN17, and the radio unit 17 is assigned a third frequency f3 as a usable frequency in the HF band. For example, 192.168.1.3 is assigned to the IP address of the radio unit 17. The radio unit 18 has an antenna AN18, and the radio unit 18 is assigned a fourth frequency f4 as a usable frequency in the HF band. For example, 192.168.1.4 is assigned to the IP address of the radio unit 18.

Each of the radio units 15-18 periodically transmits a Hello message (first message) HMG1 from its own station's corresponding antenna (AN15-AN18), and sends a Hello message from another node (radio 20). wait.

As shown in FIG. 5, the radio unit 15 to which the frequency f1 is assigned is from another node (radio device 20) containing the information of its own node (source IP address: 192.168.10.1). When the Hello message (second message) HMG2 can be received, the radio unit 15 delivers the information of the Hello message HMG2 to the communication control unit 14. At this time, the wireless unit 15 also distributes the information of its own IP address (192.168.1.1) to the communication control unit 14.

The ad hoc routing protocol ADRP of the communication control unit 14 updates the routing table RTBL according to the Hello message HMG2. When updating the routing table RTBL, the source IP address (first IP address: 192.168.10.1) of the radio 20 that has transmitted the Hello message HMG2 is set to the destination of the routing table RTBL. to register. Further, the IP address (second IP address: 192.168.1.1) of the radio unit 15 that has received and distributed the Hello message HMG2 is registered in the gateway (gateway) of the routing table RTBL.

As shown in FIG. 6, when transmitting an IP packet to the radio 20, the IP packet is transferred to the radio unit 15 (IP address: 192.168.1.1) of the gateway registered in the routing table. Therefore, the IP packet is inevitably transmitted to the radio 20 from the radio unit 15 to which the frequency f1 for which the link with the radio 20 is established is assigned.

According to the second embodiment, the IP address (192.168.10.1) of the radio 20 that has transmitted the Hello message HMG2 is registered in the destination of the routing table RTBL, and the gateway of the routing table RTBL (the gateway of the routing table RTBL). The IP address (192.168.1.1) of the radio unit 15 that has delivered the Hello message HMG2 is registered in the gateway). When transmitting the IP packet to the radio 20, the IP packet is transmitted to the radio 20 from the radio unit 15 to which the frequency f1 for which the link with the radio 20 is established is assigned. Therefore, similarly to the first embodiment, it is possible to provide ad hoc communication including frequencies in a wireless communication system that communicates by properly using a plurality of available frequencies.

Although the invention made by the present inventor has been specifically described above based on Examples, it goes without saying that the present invention is not limited to the above-described embodiments and examples, and can be variously modified. ..

The radio 20 may be any radio that can use frequencies in the HF band. The radio 20 may have the configuration of the radio 10 shown in the first embodiment, or may have the configuration of the radio 10a shown in the second embodiment.

The present invention and the present embodiment can be used for radios and wireless communication systems that utilize the short wave band. It can also be used for radios and wireless systems capable of ad hoc communication. This application claims the benefit of priority on the basis of Japanese application Japanese Patent Application No. 2018-040878 filed on March 15, 2018, the entire disclosure of which is incorporated herein by reference.

1, 1a: Wireless communication system 10, 10a, 20: Radio RTBL: Routing table ADRP: Ad hoc routing protocol FTBL: Frequency table

Claims (3)

A radio that switches between multiple frequencies in the short wave band for communication.
The radio includes an ad hoc routing protocol, a routing table, and a frequency table.
The frequency table includes a destination IP address and frequency information.
When sending IP packets to the destination IP address, the frequency of the radio is utilized, and set on the basis of the frequency information,
The radio switches the plurality of frequencies at regular intervals and transmits a first message for each frequency.
When a second message including an IP address from another node is received within a predetermined time from the transmission of the first message, the destination IP address and the frequency information of the frequency table are combined with the IP address and the first message. 2 A radio that updates with the frequency used by the radio when the message is received . A radio that communicates using the first and second frequencies of the short wave band.
Communication control unit and
The first radio unit to which the first frequency is assigned and
The second radio unit to which the second frequency is assigned and
The communication control unit, the first radio unit, and the IP network connecting the second radio unit are included.
The communication control unit
Ad hoc routing protocol and
Including the routing table,
The first radio unit and the second radio unit periodically transmit a first message.
When the first radio unit or the second radio unit receives a second message including the first IP address from another node within a predetermined time from the transmission of the first message, the second message is displayed in the routing table. The first IP address included in the above and the second IP address of the first radio unit or the second radio unit that received the second message are registered.
transceiver. With the first radio
A wireless communication system including a second radio,
The first radio can communicate using the first frequency and the second frequency in the short wave band.
The first radio is
IP network and
The communication control unit connected to the IP network and
A first radio unit connected to the IP network, to which a first IP address is assigned, and to which the first frequency is assigned,
Includes a second radio unit connected to the IP network, assigned a second IP address, and assigned the second frequency.
The communication control unit
Ad hoc routing protocol and
Including the routing table,
The first radio unit and the second radio unit periodically transmit a first message.
When the first radio receives a second message including the IP address of the second radio from the second radio within a predetermined time from the transmission of the first message, the second message is displayed in the routing table. The IP address included in the message and one of the first IP address of the first radio unit or the second IP address of the second radio unit that received the second message are registered.
When the first radio unit transmits an IP packet to the second radio device, the IP is used by using one of the registered first radio units or the second radio unit based on the routing table. Send a packet,
Wireless communication system.

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